The diagram given below represents an experiment to prove the importance of a factor in photosynthesis (a leaf partly covered with black paper held by clips). Answer the questions that follow: The diagram given below represents an experiment to prove the importance of a factor in photosynthesis (a leaf partly covered with black paper held by clips). Answer the questions that follow:
Name the factor studied in this experiment.
Topic: Factor tested — light
Answer
LIGHT (sunlight) — the experiment proves that light is necessary for photosynthesis.
The apparatus identifies the factor. A strip of BLACK PAPER covers part of the leaf, cutting off LIGHT from that part while everything else — carbon dioxide, water, chlorophyll, temperature — stays exactly the same.
THE METHOD for every photosynthesis experiment: find the ONE thing that has been removed, and that is what is being tested. BLACK PAPER over part of a leaf — removes LIGHT KOH in a flask — removes CARBON DIOXIDE a VARIEGATED leaf — removes CHLOROPHYLL from part of it Hydrilla under water — collects the OXYGEN released
Using two parts of the SAME leaf is what makes it a fair test.